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      Allen-Bradley 1756-L61
      Allen-Bradley 1756-L61

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      ControlLogix 5561 controller

      1756-L61

      Product Information:

      The Allen-Bradley 1756-L61 is a ControlLogix 5561 controller with 2 MB of user memory and 478 KB of I/O memory. It installs in a ControlLogix chassis, uses the documented series-specific battery and CompactFlash provisions, and requires firmware matched to its hardware series and the saved controller project.

      Product image is representative; revision or series may vary. Contact us to request a specific version.
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        • PRODUCT OVERVIEW

          What is this product?

          The Allen-Bradley 1756-L61 is a ControlLogix 5561 controller with 2 MB of user memory and 478 KB of I/O memory. It installs in a ControlLogix chassis, uses the documented series-specific battery and CompactFlash provisions, and requires firmware matched to its hardware series and the saved controller project.

          Selection basis

          This discontinued controller should be replaced only after the complete catalog number, hardware series, firmware, stored project, chassis modules, communication paths and battery condition are documented.
        • APPLICATIONS

          Where it may be used

          Typical industries that use a chassis-based ControlLogix controller for coordinated machine, process and utility automation.

          Automotive Manufacturing

          Coordinates assembly, material handling and station control sequences.

          Food & Beverage

          Runs batch, packaging and utility-control operations.

          Water & Wastewater

          Controls treatment trains, pumping stations and remote processes.

          Pulp & Paper

          Manages machine sections, stock preparation and plant auxiliaries.
      Technical specifications for

      1756-L61

      0 TECHNICAL PARAMETERS
      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC and Machine Control
      • Controller family:
        ControlLogix 5561
      • User memory:
        2 MB
      • I/O memory:
        478 KB
      • Nonvolatile memory:
        1784-CF64 on Series A hardware
      • Backplane current at 5.1 V:
        1.20 A
      • Backplane current at 24 V:
        14 mA
      • Power dissipation:
        3.5 W
      • Thermal dissipation:
        11.9 BTU/hr
      • Series A weight:
        0.32 kg
      • Series B weight:
        0.35 kg
      • Series A battery:
        1756-BA1
      • Series B battery:
        1756-BA2
      • Series A firmware:
        Revision 12.x or later
      • Series B firmware:
        Revision 13.40 or later
      • Operating temperature:
        0...60 °C
      • Stock Availability:
        4
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        Verify and dispatch

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      BUYER INFORMATION

      Product condition level information

      Commercial details are confirmed in writing before payment.
      • 01

        Factory Sealed

        Unused product with the original factory seal intact; packaging age or storage marks may still be present.

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      • 02

        Original Pack

        Unused product in original manufacturer packaging that was not originally factory sealed.

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      • 03

        Factory New

        New and current product sourced through the manufacturer or authorized supply channel when expressly confirmed in the quotation.

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      Revisions

      Revision Part #

      Also known as

      1756-L61 Series A
      1756-L61/A, Series A, Rev A
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      1756-L61 Series B
      1756-L61/B, Series B, Rev B
      Get Parts Quote

      Alternative Names

      1756L61 1756-L61/A 1756-L61/B ControlLogix 5561 1756-L61 1756 L61

      Information

      Overview Manuals Controller Memory Firmware Match Battery & Storage

      Features:

      • Controller identity: 1756-L61 is a ControlLogix 5561 controller with 2 MB user memory and 478 KB I/O memory.
      • Lifecycle: Rockwell Automation discontinued this catalog on June 1, 2017; replacement planning must preserve the controller project and firmware dependencies.
      • Verification focus: Confirm hardware series, firmware revision, memory arrangement, battery status, communication modules, chassis and saved project before replacement.
      Allen-Bradley 1756-L61 is a ControlLogix 5561 controller that executes the installed Logix application and coordinates chassis I/O and communications. It provides 2 MB of user memory and 478 KB of I/O memory, while hardware series, firmware major revision, battery or nonvolatile-memory provisions and project dependencies can affect replacement or migration.

      The technical content for 1756-L61 is limited to the Rockwell Automation product page and publications 1756-TD001 and 1756-UM001. Final replacement planning must compare the saved controller project, firmware, chassis, communication modules, memory use, connected I/O and the approved functional-replacement path.

      The Allen-Bradley 1756-L61 ControlLogix controller is supported by Moore Automated for verified legacy replacement and spare-part requirements.
      Allen-Bradley 1756-L61 documentation and product resources.Important Notice: Confirm the complete catalog number, hardware revision and required controlled-document revision before replacement.

      The documented 2 MB user memory and 478 KB I/O memory define this controller execution. Confirm project size, produced/consumed tags, messages and motion or redundancy features before migration.

      Series A hardware requires revision 12.x or later and Series B requires revision 13.40 or later. Preserve the validated project and review firmware compatibility before download.

      Use the correct series-specific battery and record any CompactFlash or nonvolatile-memory use. Confirm battery state, saved image and project backup before removing the installed controller.

      Technical notes

      The Allen-Bradley 1756-L61 is a ControlLogix 5561 controller with 2 MB of user memory and 478 KB of I/O memory. It installs in a ControlLogix chassis, uses the documented series-specific battery and CompactFlash provisions, and requires firmware matched to its hardware series and the saved controller project. Source: Rockwell Automation 1756-IN101 installation instructions Match 1756-L61, the hardware series, 2 MB user memory and 478 KB I/O memory. Review the saved project, chassis modules, communication ports and any nonvolatile-memory image before replacement. Back up the project, record firmware and keyswitch position, use the correct 1756-BA1 or 1756-BA2 battery, and confirm chassis power and module status before returning the controller to RUN.

      Controller Identity & Memory

      Match 1756-L61, the hardware series, 2 MB user memory and 478 KB I/O memory. Review the saved project, chassis modules, communication ports and any nonvolatile-memory image before replacement.

      Firmware & Service Checks

      Back up the project, record firmware and keyswitch position, use the correct 1756-BA1 or 1756-BA2 battery, and confirm chassis power and module status before returning the controller to RUN.

      Customs & shipping dimensions / weight

      • Packed shipping dimensions
        Confirmed after final packing
        The controller occupies one ControlLogix chassis slot; final packed dimensions are recorded after protective packing.
      • Packed shipping weight
        Confirmed after final packing
        Documented net weight is approximately 0.32 kg for Series A or 0.35 kg for Series B; final gross shipping weight is recorded after protective packing.
      • HS / customs code
        8537101190
        China customs classification for programmable-control apparatus; destination-country classification is confirmed by the customs declarant.
      • Country of origin
        USA
        The Rockwell Automation product record identifies United States of America; verify the supplied unit from its nameplate and shipment documents.
      • Ships from
        Xiamen, Fujian, China
        Dispatch location, quantity and handling time are confirmed in the written quotation.
      • Customs documents
        Confirmed for the destination
        Invoice, packing-list and origin-document requirements are agreed with the order.
      PRODUCT & ORDER FAQS

      Questions buyers ask about 1756-L61

      • How much memory does the 1756-L61 provide?

        It provides 2 MB of user memory and 478 KB of I/O memory.

      • Why must the hardware series be recorded?

        Series A and Series B use different minimum firmware and different battery provisions, so the series affects service compatibility.

      • Which battery is used with Series A hardware?

        Series A hardware uses the 1756-BA1 battery according to the installation instructions.

      • Which battery is used with Series B hardware?

        Series B hardware uses the 1756-BA2 battery according to the installation instructions.

      • Can a CompactFlash card be used?

        The instructions identify 1784-CF64 nonvolatile memory for Series A hardware. Confirm series and project procedure first.

      • What backplane current does the controller require?

        The documented demand is 1.20 A at 5.1 V DC and 14 mA at 24 V DC.

      • Can a newer controller replace it without project review?

        No. Memory, firmware, project features, communications, chassis modules and migration requirements must be engineered.

      • What should be supplied with a sourcing request?

        Provide quantity, full nameplate, hardware series, firmware revision, project information, destination and required date.
      All FAQ
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          • 20+ years of experience

            Over 20 years of experience in industrial automation and hard-to-source legacy parts.

          • Product Lifecycle Stage

            Discontinued / Functional Replacement Required

            Rockwell Automation lists 1756-L61 as discontinued since June 1, 2017. Moore Automated supports verified legacy sourcing and migration planning for installed ControlLogix systems. Confirm hardware series, firmware, memory, stored project, communication modules and the approved functional-replacement path before substitution.

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          Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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